Apparatus, system, and method for diverting fluid

ABSTRACT

A pump component is removed from a port of a suction-side fluid cavity of a high-pressure fluid pump. The pump component performs a pump function for the high-pressure fluid pump. A primary coupler connects to the port. The pump component connects to the primary coupler. A diverter fluid passage diverts a low-pressure fluid from the primary coupler to an auxiliary fluid delivery system. The primary coupler communicates the low-pressure fluid through the pump component and primary coupler to the port.

CROSS-REFERENCES TO RELATED APPLICATIONS

This application is a continuation-in-part of and claims priority toU.S. patent application Ser. No. 11/156,682 entitled “APPARATUS, SYSTEM,AND METHOD FOR INTERMITTENTLY DELIVERING FLUID” and filed on Jun. 20,2005 for John T. Carroll III and Laszlo D. Tikk, which is incorporatedherein by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to diverting fluid and more particularly relatesto diverting fluid from a high-pressure pump.

2. Description of the Related Art

A mechanical device such as an internal combustion engine often includesa high-pressure fluid pump. For example, a diesel engine may include ahigh-pressure fuel pump to deliver fuel from a storage tank to a fuelinjection system. The mechanical device typically requires thehigh-pressure fluid pump to deliver the fluid within specified flow rateand pressure ranges. Devices receiving the fluid often only functionproperly if the fluid is within the specified flow rate and pressureranges. The high-pressure fluid pump may require one or more pumps,filters, regulators, controllers, and the like to supply the fluidwithin the specified flow rate and pressure ranges.

The mechanical device may also have a secondary use for the fluid. Forexample, a catalytic converter of an internal combustion engine is oftenregenerated by intermittently injecting fuel into the exhaust gasupstream of the converter. Unfortunately, the diversion of fuel from ahigh-pressure fluid pump may reduce the flow rate and fluid pressurebelow the specified flow rate and pressure ranges. As a result, themechanical device may require a costly separate auxiliary fluid supplysystem including additional pumps, filters, regulators, and controllersto supply the secondary fluid use without disrupting the high-pressurefluid pump supply.

The cost of the auxiliary fluid delivery system may be reduced if alow-pressure fluid upstream of the high-pressure fluid pump can bediverted and used. Unfortunately, the low-pressure fluid may not beeasily accessible, particularly in a system with an integratedhigh-pressure fluid pump and low-pressure fluid pump that is notconfigured to provide the low-pressure fluid.

SUMMARY OF THE INVENTION

From the foregoing discussion it is apparent that there is a need for anapparatus, system and method for diverting fluid. Beneficially, such anapparatus, system, and method would reduce the space and cost requiredto deliver low-pressure fluid within a mechanical device. The presentinvention has been developed in response to the present state of theart, and in particular, in response to the problems and needs in the artthat have not yet been fully solved by currently available fluiddiversion systems. Accordingly, the present invention has been developedto provide an apparatus, system, and method for diverting fluid thatovercome many or all of the above-discussed shortcomings in the art.

The apparatus to divert is provided with a plurality of elementsconfigured to functionally execute the necessary steps of removing apump component, connecting a primary coupler, connecting the pumpcomponent, divert a low-pressure fluid, and communicating thelow-pressure fluid through the pump component and primary coupler. Theapparatus includes the primary coupler and a diverter fluid passage.

The primary coupler is configured to connect to a port of a suction-sidefluid cavity of a high-pressure fluid pump. The port is configured toreceive the pump component. The pump component performs a pump functionfor the high-pressure fluid pump.

The diverter fluid passage diverts a low-pressure fluid from the primarycoupler to an auxiliary fluid delivery system. The primary couplerconnects to the pump component and communicates the low-pressure fluidto the pump component. The apparatus diverts the low-pressure fluid thatmay otherwise by inaccessible.

A system of the present invention is also presented for diverting fluid.The system may be embodied in a diesel engine. In particular, thesystem, in one embodiment, includes a high-pressure fluid pump, a pumpcomponent, an auxiliary fluid delivery system, a primary coupler, and adiverter fluid passage.

The high-pressure fluid pump includes a port to a suction-side fluidcavity. The pump component performs a pump function for thehigh-pressure fluid pump. The port is configured to receive the pumpcomponent. The auxiliary fluid delivery system is configured to delivera fluid.

The primary coupler connects to the port. In addition, the primarycoupler communicates low-pressure fluid to the pump component. Thediverter fluid passage diverts the low-pressure fluid from the primarycoupler to the auxiliary fluid delivery system. The system divertsinaccessible low-pressure fluid to the auxiliary fluid delivery system,reducing the cost of adding the auxiliary fluid delivery system.

A method of the present invention is also presented for intermittentlydelivering fluid. The method in the disclosed embodiments substantiallyincludes the steps necessary to carry out the functions presented abovewith respect to the operation of the described apparatus and system. Inone embodiment, the method includes removing a pump component,connecting a primary coupler, connecting the pump component, diverting alow-pressure fluid, and communicating the low-pressure fluid through thepump component and primary coupler.

A pump component is removed from a port of a suction-side fluid cavityof a high-pressure fluid pump. The pump component performs a pumpfunction for the high-pressure fluid pump. A primary coupler connects tothe port. The pump component connects to the primary coupler. A diverterfluid passage diverts a low-pressure fluid from the primary coupler toan auxiliary fluid delivery system. The primary coupler communicates thelow-pressure fluid through the pump component and primary coupler to theport. The method diverts the low-pressure fluid for use by the auxiliaryfluid delivery system.

Reference throughout this specification to features, advantages, orsimilar language does not imply that all of the features and advantagesthat may be realized with the present invention should be or are in anysingle embodiment of the invention. Rather, language referring to thefeatures and advantages is understood to mean that a specific feature,advantage, or characteristic described in connection with an embodimentis included in at least one embodiment of the present invention. Thus,discussion of the features and advantages, and similar language,throughout this specification may, but do not necessarily, refer to thesame embodiment.

Furthermore, the described features, advantages, and characteristics ofthe invention may be combined in any suitable manner in one or moreembodiments. One skilled in the relevant art will recognize that theinvention can be practiced without one or more of the specific featuresor advantages of a particular embodiment. In other instances, additionalfeatures and advantages may be recognized in certain embodiments thatmay not be present in all embodiments of the invention.

The embodiment of the present invention diverts low-pressure fluid froma high-pressure fluid pump. The present invention may supply anauxiliary fluid delivery system with the low-pressure fluid in place ofa dedicated low-pressure supply system. These features and advantages ofthe present invention will become more fully apparent from the followingdescription and appended claims, or may be learned by the practice ofthe invention as set forth hereinafter.

BRIEF DESCRIPTION OF THE DRAWINGS

In order that the advantages of the invention will be readilyunderstood, a more particular description of the invention brieflydescribed above will be rendered by reference to specific embodimentsthat are illustrated in the appended drawings. Understanding that thesedrawings depict only typical embodiments of the invention and are nottherefore to be considered to be limiting of its scope, the inventionwill be described and explained with additional specificity and detailthrough the use of the accompanying drawings, in which:

FIG. 1 is a schematic block diagram illustrating one embodiment of apump system in accordance the present invention;

FIG. 2 is a schematic block diagram illustrating one embodiment of adiversion apparatus of the present invention;

FIG. 3 is a schematic block diagram illustrating one alternateembodiment of a diversion apparatus of the present invention;

FIG. 4 is a schematic block diagram illustrating one embodiment of asingle connection diversion apparatus of the present invention;

FIG. 5A is a side view drawing illustrating one embodiment of adiversion apparatus of the present invention;

FIG. 5B is a side view drawing illustrating one embodiment of a port ofthe present invention;

FIG. 6 is a schematic block diagram illustrating one embodiment of anauxiliary fluid delivery system of the present invention;

FIG. 7 is a schematic flow chart diagram illustrating one embodiment ofa diversion method of the present invention;

FIG. 8 is an isometric drawing illustrating one embodiment of a pumpsystem with diversion of the present invention; and

FIG. 9 is an isometric drawing illustrating one alternate embodiment ofa pump system with diversion in accordance with present invention.

DETAILED DESCRIPTION OF THE INVENTION

Reference throughout this specification to “one embodiment,” “anembodiment,” or similar language means that a particular feature,structure, or characteristic described in connection with the embodimentis included in at least one embodiment of the present invention. Thus,appearances of the phrases “in one embodiment,” “in an embodiment,” andsimilar language throughout this specification may, but do notnecessarily, all refer to the same embodiment.

Furthermore, the described features, structures, or characteristics ofthe invention may be combined in any suitable manner in one or moreembodiments. In the following description, numerous specific details areprovided, such as examples of pumps, pump components, loads, to providea thorough understanding of embodiments of the invention. One skilled inthe relevant art will recognize, however, that the invention can bepracticed without one or more of the specific details, or with othermethods, components, materials, and so forth. In other instances,well-known structures, materials, or operations are not shown ordescribed in detail to avoid obscuring aspects of the invention.

FIG. 1 is a schematic block diagram illustrating one embodiment of apump system 100 in accordance the present invention. The system 100includes a fluid store 105, a low-pressure fluid pump 110, a regulator130, a pump component 115, a high-pressure fluid pump 120, and ahigh-pressure load 125.

The low-pressure fluid pump 110 draws fluid from the fluid store 105.The fluid may be a hydrocarbon-based fuel. In one embodiment, the fluidis diesel fuel. Low-pressure fluid exiting from the low-pressure fluidpump 110 may have a pressure in the range of three hundred to threethousand kilopascals (300-3,000 kPa). The regulator 130 regulates thepressure of the fluid delivered to the pump component 115, divertingexcess fluid to the fluid store 105 to reduce pressure.

The pump component 115 may be a proportional metering valve. One ofskill in the art will recognize that a variety of types of pumpcomponents 115 may be used to practice the present invention. Acomponent fluid inlet 135 of the pump component 115 connects to anoutput of the low-pressure fluid pump 110. In addition, a componentfluid outlet 140 of the pump component 115 connects to a port of asuction-side fluid cavity of the high-pressure fluid pump 120. In oneembodiment, the pump component 115 regulates the low-pressure fluiddelivered to the high-pressure fluid pump 120. For example the pumpcomponent 115 may restrict the flow of fluid to the high-pressure fluidpump 120.

The high-pressure fluid pump 120 may deliver high-pressure fluid to thehigh-pressure load 125. In one embodiment, the high-pressure fluid has apressure in the range of forty thousand to two hundred fifty thousandkilopascals (40,000-250,000 kPa). In a certain embodiment, thehigh-pressure fluid has a pressure in the range of seventy-five thousandto one hundred fifty thousand kilopascals (75,000-150,000 kPa). Thehigh-pressure load 125 may be a fuel injection system.

In one embodiment, the low-pressure fluid pump 110, regulator 130, pumpcomponent 115 and high-pressure fluid pump 120 forms an integrated unit.Thus the low-pressure fluid exiting from the low-pressure fluid pump 110is not available for use by an auxiliary fluid delivery system. Thepresent invention diverts low-pressure fluid to supply the auxiliaryfluid delivery system as will be described hereafter.

FIG. 2 is a schematic block diagram illustrating one embodiment of adiversion apparatus 200 of the present invention. The diversionapparatus 200 diverts fluid from the system 100 of FIG. 1. The apparatus200 includes the elements of FIG. 1, like numbers referring to likeelements. In addition, the apparatus 200 includes an auxiliary fluiddelivery system 205, a primary coupler 210, and a diverter fluid passage215.

The primary coupler 210 connects to the port of the suction-side fluidcavity of the high-pressure fluid pump 120 in place of the pumpcomponent 115. In addition, the primary coupler 210 may receivelow-pressure fluid from the low-pressure fluid pump 110 and provide thelow-pressure fluid to the component fluid inlet 135 of the pumpcomponent 115. The primary coupler 210 may also communicate alow-pressure fluid from the component fluid outlet 140 to the port ofthe high-pressure fluid pump 120. Thus primary coupler 210 connects tothe low-pressure fluid pump 110 and high-pressure fluid pump 120 inplace of the pump component 115. The primary coupler 210 provideslow-pressure fluid to the pump component 115 and transmits low-pressurefluid from the pump component 115 to the high-pressure pump 120.

In addition, the diverter fluid passage 215 diverts a portion of fluidupstream of the pump component 115 to the auxiliary fluid deliverysystem 205. The auxiliary fluid delivery system 205 and diverter fluidpassage 215 will be described hereafter. By taking the place of the pumpcomponent 115, the primary coupler 210 allows the diversion of thelow-pressure fluid by the diverter fluid passage 215 when thelow-pressure fluid may be otherwise unavailable.

FIG. 3 is a schematic block diagram illustrating one alternateembodiment of a diversion apparatus 300 of the present invention. Theapparatus 300 includes the primary coupler 210 and diverter fluidpassage 215 of FIG. 2. As in FIG. 2, the primary coupler 210 connects tothe port of the suction-side fluid cavity of the high-pressure fluidpump 120 in place of the pump component 115, receives low-pressure fluidfrom the low-pressure fluid pump 110 in place of the pump component 115and communicates the low-pressure fluid through the pump component 115to the high-pressure fluid pump 120. The diverter fluid passage 215diverts a portion of the low-pressure fluid downstream of the pumpcomponent 115 to the auxiliary fluid delivery system 205.

FIG. 4 is a schematic block diagram illustrating one embodiment of asingle connection diversion apparatus 400 of the present invention. Thediversion apparatus 400 diverts fluid from the system 100 of FIG. 1. Theapparatus includes the elements of FIGS. 1-3, like numbers referring tolike elements.

The low-pressure fluid pump 110 delivers directly to the component fluidinlet 135 of the pump component 115. The low-pressure fluid pump 110 maydeliver the fluid through a flexible tube. The pump component 115connects to the primary coupler 210 instead of to the port of thehigh-pressure fluid pump 120. The primary coupler 210 connects to theport of the suction-side fluid cavity of the high-pressure fluid pump120 in place of the pump component 115.

As in FIG. 3, the diverter fluid passage 215 diverts a portion oflow-pressure fluid from the pump component 115 to the auxiliary fluiddelivery system 205. The apparatus 400 diverts low-pressure fluiddownstream of the pump component 115 while allowing the pump component115 to operate normally within the fluid circuit of the high-pressurefluid pump 120.

FIG. 5A is a side view drawing illustrating one embodiment of adiversion apparatus 500 of the present invention. The diversionapparatus 500 shows a configuration of the apparatus 200 of FIG. 2. Thedescription of the apparatus 500 refers to elements of FIGS. 1-2, likenumbers referring to like elements.

The apparatus 500 includes the primary coupler 210, the diverter fluidpassage 215, and an auxiliary connector 530. The pump component 115connects to the primary coupler 210 at a component connector 535. Thecomponent connector 535 may be a drilled bore configured to receive thepump component 115 and seat one or more o-rings.

A port fluid outlet passage that will be described hereaftercommunicates low-pressure fluid to a coupler fluid inlet passage 505.The coupler fluid inlet passage 505 communicates the low-pressure fluidto the component fluid inlet 135 and to the diverter fluid passage 215.A coupler fluid outlet passage 510 communicates a low-pressure fluiddownstream of the pump component 115 from the component fluid outlet 140to a port fluid inlet passage that will be described hereafter.

In one embodiment, an orifice 525 receives low-pressure fluid from thediverter fluid passage 215 and communicates the low-pressure fluid tothe auxiliary connector 530 as will be described hereafter. Theauxiliary connector 530 may connect the apparatus 500 to the auxiliaryfluid delivery system 205 and deliver the low-pressure fluid to theauxiliary fluid delivery system 205.

The apparatus 500 may be machined from metal and/or a ceramic material.Alternatively, the apparatus 500 may be cast using metal and/or atemperature-resistant plastic.

FIG. 5B is a side view drawing illustrating one embodiment of a port 550of the present invention. The port 550 may be the port of thehigh-pressure fluid pump 120 of FIGS. 1-4. The port 550 is originallyconfigured to receive the pump component 115. The port 550 may alsoreceive the primary coupler 210 of FIG. 5A.

The port fluid outlet passage 555 may be in communication with thelow-pressure fluid that is received from an internal passage of thehigh-pressure fluid pump 120. The internal passage may receive thelow-pressure fluid from the low-pressure fluid pump 110. In oneembodiment, the internal passage is inaccessible as the low-pressurefluid pump 110 is integrated with the high-pressure fluid pump 120. Theport fluid outlet passage 555 may be configured to connect to either thecoupler fluid inlet passage 505 or the component fluid inlet 135.

The port fluid inlet passage 560 communicates with the suction-sidefluid cavity of the high-pressure fluid pump 120. The port fluid inletpassage 560 may be configured to connect to either the component fluidoutlet 140 or the coupler fluid outlet passage 510.

The port 550 is shown with an axis 565. The port 550 may be configuredto receive the pump component 115 in-line along the axis 565. Theprimary coupler 210 connects to the port 550 in-line along the axis 565.

FIG. 6 is a schematic block diagram illustrating one embodiment of anauxiliary fluid delivery system 600 of the present invention. Theauxiliary fluid delivery system 600 may be the auxiliary fluid deliverysystem 205 of FIGS. 2-4. The description of the system 600 refers toelements of FIGS. 1-5, like numbers referring to like elements. Thesystem 600 shows the diverter fluid passage 215 and includes the orifice525, the auxiliary connector 530, an accumulator 605, an injector 610,and a load 615.

In one embodiment, the orifice 525 diverts a specified quantity of thelow-pressure fluid from the diverter fluid passage 215 over a secondtime interval. In a certain embodiment, the specified quantity of fluidis in the range of zero point one percent to five percent (0.1%-5%) ofthe fluid supplied by the high-pressure fluid pump 120. The orifice 525diverts the specified quantity of fluid over the second time interval.The second time interval may be a time interval between regenerationcycles for a catalytic converter. In one embodiment, the minimumeffective area of the orifice A is calculated using Equation 1, where V₁is the volume of the specified quantity of fluid, T₂ is the second timeinterval, ΔP is difference between a maximum and a minimum of thepressure range of the low-pressure fluid across the orifice 525, and ρis a fluid density. $\begin{matrix}{A \geq \frac{V_{1}}{\int_{0}^{T_{2}}{\sqrt{\frac{2\Delta\quad P}{\rho}}{\mathbb{d}t}}}} & {{Equation}\quad 1}\end{matrix}$

In one embodiment, the fluid density ρ is in the range of five hundredto eight hundred kilograms per cubic meter (500-800 kg/m³). Thespecified quantity may be in the range of five to fifty grams (5-50 g).

The accumulator 605 may accumulate fluid over the second time interval.In one embodiment, the accumulator 605 employs the fluid pressure oflow-pressure fluid to accumulate a fluid charge. The accumulator 605 maybe configured as a reservoir with a flexible gas-charged diaphragm. Thediaphragm may deform in response to the positive pressure of the fluid,increasing the pressure of the diaphragm gas as is well known to thoseskilled in the art.

The injector 610 intermittently delivers the specified quantity of fluidover a first time interval to the load 615. For example, the injector610 may deliver the specified quantity of fluid to the load 615 for afirst time interval of one second (1 s). The accumulator 605 may thenaccumulate the specified quantity of fluid over a second time interval.In one embodiment, the second time interval is thirty seconds (30 s).

In one embodiment, the load 615 may be an exhaust gas emission controlsystem such as a catalytic converter. The injector 610 may deliver afluid such as diesel fuel to the catalytic converter to regenerate thecatalytic converter. The auxiliary fluid delivery system 600 regeneratesthe catalytic converter using the diverted fluid without the cost of anadditional low-pressure fluid supply system.

The schematic flow chart diagram that follows is generally set forth asa logical flow chart diagram. As such, the depicted order and labeledsteps are indicative of one embodiment of the presented method. Othersteps and methods may be conceived that are equivalent in function,logic, or effect to one or more steps, or portions thereof, of theillustrated method. Additionally, the format and symbols employed areprovided to explain the logical steps of the method and are understoodnot to limit the scope of the method. Although various arrow types andline types may be employed in the flow chart diagrams, they areunderstood not to limit the scope of the corresponding method. Indeed,some arrows or other connectors may be used to indicate only the logicalflow of the method. For instance, an arrow may indicate a waiting ormonitoring period of unspecified duration between enumerated steps ofthe depicted method. Additionally, the order in which a particularmethod occurs may or may not strictly adhere to the order of thecorresponding steps shown.

FIG. 7 is a schematic flow chart diagram illustrating one embodiment ofa diversion method 700 of the present invention. The method 700substantially includes the steps to carry out the functions presentedabove with respect to the operation of the described apparatus andsystem of FIGS. 1-6. The description of the method 700 refers toelements of FIGS. 1-6, like numbers referring to like elements.

The method 700 begins and the pump component 115 is removed 705 from theport 550 of the suction-side fluid cavity of the high-pressure fluidpump 120. The pump component 115 performs a pump function for thehigh-pressure fluid pump 120.

The primary coupler 210 connects 710 to the port 550. In one embodiment,the primary coupler connects 710 in-line along the axis 565 of the port550 in place of the pump component 115. Thus the port 550 may not needto be modified to receive the primary coupler 210.

The pump component 115 connects 715 to the primary coupler 210. In oneembodiment, the pump component 115 is disposed in-line with the axis 565of the port 550. In an alternate embodiment, the pump component 115 isdisposed at an angle in the range of zero to ninety degrees (0-90°) tothe axis 565 of the port 550.

The diverter fluid passage 215 diverts 720 the low-pressure fluid fromthe primary coupler 210 to the auxiliary fluid delivery system 205. Theprimary coupler 210 communicates 725 the low-pressure fluid through thepump component 115 to the port 550. Thus the pump component 115 maystill perform the pump function and the port 550 receives a low-pressurefluid downstream of the pump component 115. The method 700 diverts thelow-pressure fluid to the auxiliary fluid delivery system 205 when thelow-pressure fluid is otherwise inaccessible from the high-pressurefluid pump 120.

FIG. 8 is an isometric drawing illustrating one embodiment of a pumpsystem 800 with diversion of the present invention. The description ofthe pump system 800 refers to elements of FIGS. 1-6, like numbersreferring to like elements.

The high-pressure fluid pump 120 may be a LDA V6 Bosch diesel pump. Theprimary coupler 210 is shown connected to the high-pressure fluid pump120 at the port 550. The port 550 is obscured by the primary coupler210. The pump component 115 is connected to the primary coupler 210. Asshown, the pump component 115 may be disposed in-line to the axis 565 ofthe port 550.

Tubing 805 carries the low-pressure fluid from the auxiliary connector530 to accumulator 605. The accumulator 605 delivers the specifiedquantity of the fluid to the injector 610. The injector 610 delivers thefluid without the need for an additional low-pressure fluid supplysystem as the low-pressure fluid is scavenged from the high-pressurefluid pump 120.

FIG. 9 is an isometric drawing illustrating one alternate embodiment ofa diversion apparatus 900 of the present invention. The diversionapparatus 900 may be the apparatus 200, 300 of FIGS. 2-3. Thedescription of the apparatus 900 refers to elements of FIGS. 1-6, likenumbers referring to like elements.

The pump component 115 is shown connected to the primary coupler 210disposed at a ninety-degree angle (90°) to the axis 565 of the port 550.The auxiliary connector 530 is shown as tubing connector. The couplerfluid inlet passage 505 and coupler fluid outlet passage 510 of theprimary coupler 210 are shown where the coupler fluid inlet passage 505and coupler fluid outlet passage 510 interface to the port fluid outletpassage 555 and port fluid inlet passage 560 respectively, or the port550.

The embodiment of the present invention diverts low-pressure fluid fromthe high-pressure fluid pump 120. The present invention may supply theauxiliary fluid delivery system 205 with the low-pressure fluid in placeof a dedicated low-pressure supply system.

The present invention may be embodied in other specific forms withoutdeparting from its spirit or essential characteristics. The describedembodiments are to be considered in all respects only as illustrativeand not restrictive. The scope of the invention is, therefore, indicatedby the appended claims rather than by the foregoing description. Allchanges which come within the meaning and range of equivalency of theclaims are to be embraced within their scope.

1. An apparatus for diverting fluid, the apparatus comprising: a primarycoupler configured to connect to a port of a suction-side fluid cavityof a high-pressure fluid pump, wherein the port is configured to receivea pump component and the pump component performs a pump function for thehigh-pressure fluid pump; a diverter fluid passage configured to diverta low-pressure fluid from the primary coupler to an auxiliary fluiddelivery system; and the primary coupler further configured to connectto the pump component and communicate the low-pressure fluid to the pumpcomponent.
 2. The apparatus of claim 1, wherein the port comprises aport fluid outlet passage that is in communication with the low-pressurefluid that is received from an internal passage of the high-pressurefluid pump and a port fluid inlet passage that is in communication withthe suction-side fluid cavity, the pump component comprises a componentfluid inlet and a component fluid outlet, the primary coupler comprisesa coupler fluid inlet passage configured to communicate the low-pressurefluid between the port fluid outlet, the diverter fluid passage, and thecomponent fluid inlet, and the primary coupler comprises a coupler fluidoutlet passage configured to communicate a low-pressure fluid downstreamof the pump component between the component fluid outlet and the portfluid inlet passage.
 3. The apparatus of claim 2, wherein the pumpcomponent is configured as a proportional metering valve that regulatesfluid received from a low-pressure pump.
 4. The apparatus of claim 1,wherein the diverter fluid passage diverts the low-pressure fluid to anorifice of the auxiliary fluid delivery system, the orifice having aneffective area A calculated as$A \geq \frac{V_{1}}{\int_{0}^{T_{2}}{\sqrt{\frac{2\Delta\quad P}{\rho}}{\mathbb{d}t}}}$where V₁ is a volume of a specified quantity of fluid, T₂ is a secondtime interval, ΔP is a pressure difference across the orifice, and ρ isa fluid density.
 5. The apparatus of claim 1, wherein the fluid isdiesel fuel.
 6. The apparatus of claim 6, wherein the auxiliary fluiddelivery system delivers the diesel fuel to a catalytic converter, andthe diesel fuel aids chemical reduction of nitrogen oxides in thecatalytic converter.
 7. The apparatus of claim 6, wherein thehigh-pressure fluid pump is a LDA V6 Bosch high-pressure fuel pump. 8.The apparatus of claim 1, wherein the pump component is disposed in-linewith an axis of the port.
 9. The apparatus of claim 1, wherein the pumpcomponent is disposed at an angle in the range of zero to ninety degreesto an axis of the port.
 10. The apparatus of claim 1, wherein the portcomprises a port fluid outlet passage that is in communication with alow-pressure fluid upstream of the pump component that is received froman internal passage of the high-pressure fluid pump and a port fluidinlet passage that is in communication with the suction-side fluidcavity, the pump component comprises a component fluid inlet and acomponent fluid outlet, the primary coupler comprises a coupler fluidinlet passage configured to communicate the upstream low-pressure fluidbetween the port fluid outlet and the component fluid inlet, and theprimary coupler comprises a coupler fluid outlet passage configured tocommunicate the low-pressure fluid between the component fluid outlet,the diverter fluid passage, and the port fluid inlet passage.
 11. Amethod for diverting fluid, the method comprising: removing a pumpcomponent that performs a pump function for a high-pressure fluid pumpfrom a port of a suction-side fluid cavity of the high-pressure fluidpump; connecting a primary coupler to the port; connecting the pumpcomponent to the primary coupler; diverting a low-pressure fluid fromthe primary coupler through a diverter fluid passage to an auxiliaryfluid delivery system; and communicating the low-pressure fluid throughthe pump component and primary coupler to the port.
 12. The method ofclaim 11, wherein the port comprises a port fluid outlet passage that isin communication with the low-pressure fluid that is received from aninternal passage of the high-pressure fluid pump and a port fluid inletpassage that is in communication with the suction-side fluid cavity, thepump component comprises a component fluid inlet and a component fluidoutlet, the primary coupler comprises a coupler fluid inlet passageconfigured to communicate the low-pressure fluid between the port fluidoutlet, the diverter fluid passage, and the component fluid inlet, andthe primary coupler comprises a coupler fluid outlet passage configuredto communicate a low-pressure fluid downstream of the pump componentbetween the component fluid outlet and the port fluid inlet passage. 13.The method of claim 12, wherein the pump component is configured as aproportional metering valve that regulates fluid received from alow-pressure pump.
 14. The method of claim 11, wherein the low-pressurefluid is diverted to an orifice of the auxiliary fluid delivery system,the orifice having an effective area A calculated as$A \geq \frac{V_{1}}{\int_{0}^{T_{2}}{\sqrt{\frac{2\Delta\quad P}{\rho}}{\mathbb{d}t}}}$where V₁ is a volume of a specified quantity of fluid, T₂ is a secondtime interval, ΔP is a pressure difference across the orifice, and ρ isa fluid density.
 15. The method of claim 11, wherein the fluid is dieselfuel.
 16. The method of claim 15, wherein the auxiliary fluid deliverysystem delivers the diesel fuel to a catalytic converter, and the dieselfuel aids chemical reduction of nitrogen oxides in the catalyticconverter.
 17. A system for diverting fluid, the system comprising: ahigh-pressure fluid pump comprising a port to a suction-side fluidcavity; a pump component that performs a pump function for thehigh-pressure fluid pump, wherein the port is configured to receive thepump component; an auxiliary fluid delivery system configured to deliverfluid; a primary coupler connected to the port; a diverter fluid passagethat diverts a low-pressure fluid from the primary coupler to theauxiliary fluid delivery system; and the primary coupler furtherconfigured to connect to the pump component and communicate thelow-pressure fluid to the pump component.
 18. The system of claim 17,wherein the port comprises a port fluid outlet passage that is incommunication with the low-pressure fluid that is received from aninternal passage of the high-pressure fluid pump and a port fluid inletpassage that is in communication with the suction-side fluid cavity, thepump component comprises a component fluid inlet and a component fluidoutlet, the primary coupler comprises a coupler fluid inlet passageconfigured to communicate the low-pressure fluid between the port fluidoutlet, the diverter fluid passage, and the component fluid inlet, andthe primary coupler comprises a coupler fluid outlet passage configuredto communicate a low-pressure fluid downstream of the pump componentbetween the component fluid outlet and the port fluid inlet passage. 19.The system of claim 18, wherein the pump component is configured as aproportional metering valve that regulates fluid received from alow-pressure pump.
 20. The system of claim 19, wherein the fluid isdiesel fuel.
 21. The system of claim 20, the auxiliary fluid deliverysystem comprising an orifice, an accumulator, and an injector.
 22. Thesystem of claim 21, wherein the diverter fluid passage diverts thelow-pressure diesel fuel to the orifice, the orifice having an effectivearea A calculated as$A \geq \frac{V_{1}}{\int_{0}^{T_{2}}{\sqrt{\frac{2\Delta\quad P}{\rho}}{\mathbb{d}t}}}$where V₁ is a volume of a specified quantity of diesel fuel, T₂ is asecond time interval, ΔP is a pressure difference across the orifice,and ρ is a diesel fuel density.
 23. The system of claim 22, wherein theinjector delivers the diesel fuel to a catalytic converter, and thediesel fuel aids chemical reduction of nitrogen oxides in the catalyticconverter.
 24. The system of claim 23, further comprising a dieselengine, wherein the high-pressure fluid pump is configured to deliverthe diesel fuel to the diesel engine.
 25. An apparatus for divertingdiesel fuel, the apparatus comprising: means for connecting to a port ofa suction-side fuel cavity of a high-pressure fuel pump, connecting to apump component, and communicating a low-pressure diesel fuel through thepump component and primary coupler to the port, wherein the port isoriginally configured to receive the pump component and the pumpcomponent performs a pump function for the high-pressure fuel pump;means for diverting the low-pressure diesel fuel from the connectingmeans to an auxiliary fuel delivery system; and means for limiting thelow-pressure fuel diverted to the auxiliary fuel delivery system, thelimiting means having an effective area A calculated as$A \geq \frac{V_{1}}{\int_{0}^{T_{2}}{\sqrt{\frac{2\Delta\quad P}{\rho}}{\mathbb{d}t}}}$ where V₁ is a volume of a specified quantity of diesel fuel, T₂ is asecond time interval, ΔP is a pressure difference across the orifice,and ρ is a diesel fuel density.